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// file : libbutl/host-os-release.hxx -*- C++ -*-
// license : MIT; see accompanying LICENSE file
#pragma once
#include <string>
#include <vector>
#include <libbutl/optional.hxx>
#include <libbutl/target-triplet.hxx>
#include <libbutl/export.hxx>
namespace butl
{
// Information extracted from /etc/os-release on Linux. See os-release(5)
// for background. For other platforms we derive the equivalent information
// from other sources. Some examples:
//
// {"debian", {}, "10", "",
// "Debian GNU/Linux", "buster", ""}
//
// {"fedora", {}, "35", "workstation",
// "Fedora Linux", "", "Workstation Edition"}
//
// {"ubuntu", {"debian"}, "20.04", "",
// "Ubuntu", "focal", ""}
//
// {"macos", {}, "12.5", "",
// "Mac OS", "", ""}
//
// {"freebsd", {}, "13.1", "",
// "FreeBSD", "", ""}
//
// {"windows", {}, "10", "",
// "Windows", "", ""}
//
// Note that for Mac OS, the version is the Mac OS version (as printed by
// sw_vers) rather than Darwin version (as printed by uname).
//
// For Windows we currently do not distinguish the Server edition and the
// version mapping is as follows:
//
// Windows 11 11
// Windows 10 10
// Windows 8.1 8.1
// Windows 8 8
// Windows 7 7
// Windows Vista 6
// Windows XP Pro/64-bit 5.2
// Windows XP 5.1
// Windows 2000 5
//
// Note that version_id may be empty, for example, on Debian testing:
//
// {"debian", {}, "", "",
// "Debian GNU/Linux", "", ""}
//
// Note also that we don't extract PRETTY_NAME because its content is
// unpredictable. For example, it may include variant, as in "Fedora Linux
// 35 (Workstation Edition)". Instead, construct it from the individual
// components as appropriate, normally "$name $version ($version_codename)".
//
struct os_release
{
std::string name_id; // ID
std::vector<std::string> like_ids; // ID_LIKE
std::string version_id; // VERSION_ID
std::string variant_id; // VARIANT_ID
std::string name; // NAME
std::string version_codename; // VERSION_CODENAME
std::string variant; // VARIANT
};
// Return the release information for the specified host or nullopt if the
// specific host is unknown/unsupported. Throw std::runtime_error if
// anything goes wrong.
//
// Note that "host" here implies that we may be running programs, reading
// files, examining environment variables, etc., of the machine we are
// running on.
//
LIBBUTL_SYMEXPORT optional<os_release>
host_os_release (const target_triplet& host);
}
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